Thread-cutting tool



' I I 1616650 Feb. 8,1927. v & BORDEN V 2 THREAD CUTTING TOOL FiledM'rch 23.- 1925 M Illlllllifli I I I mu 2 Sheets-Shed 1- work even in aPatented Feb. s, 1927."

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BRADFORD BURDEN", OF' GLEVEL'ZAND, OHIO.-

TI-IBEAD-GUTTIN G TOOIn- Application filed March 23, 1925. Serial-No.17,737

1 The pipe threading tool: forming the subject-matter of thepresentdesigned particularly with: a view to the cutting of various s zed workwith. but one without necessitating the V 5 set of dies and removal ofthe dies from the stock. The invention contemplates among other thingsaconstruction wherein the dies may be quickly and accurately set vpoorly lighted shop, and

which once havingbeen set will beelfective- 1y held in set posit onagainst accidental' movement during the manipulation of the v tooleither in thethreading. operation or in the changing from one pieceof'worli to anothen. v p

Otherobjeotsof the invention are to provide a slidablesupport for eachdie wl'iioh v is controlled in'a Y movement toward an 2 from the axisofthework by the movement 0f-the die stock; to furnish an adjustingmeans for each die and anovehconnection between said adjusting'means anddie where-.

by the in use,and

samewill not become separated while generally to provide a constructionwhich Wlll be of a very simple and: durable nature and highly eflicientin prac' tical use,

The various features of novelty which 39 characterize my invention arepointed'out with particularity in the claims annexed to. and forming,apart of this specification, For t a. better understandingoftheinvention, however,v

accompanying drawings in connection with a the follow-ingdescriptilvematter, the drawin'gs' depicting what I now regard as apreferred; embodiment of the-invention. v we Iathe, drawings, wherein.like reference 40 characters denote like parts throughout all 'VlGWS g vFigure 1 isa top planiview of a diestock embodyingmyinvention; V

Figure 2 is an elevation;

Figure 8 is a fragmentary vertical sec tionalview; 7 I Figure 4 isasection on the'line of li i ii; v Y iigure :51 is. a section onnthe line545 of v j iguredis an innerend view ofoneof the slidewaysy l a a Figure77" is a perspective detail of 'a washer, and" p i v v 55 Figure 8Lis a,sectional view similar to Figure 3-illustrat1ng a modificati on.

invention has been 7 for different sized 1 reference should be had tothe i in Tshaped slot opening-of the I trolled by means of a set screw12; Itfisto Referring specifically to the drawings,

the numeral 1 denotesa work holder'whichi an annulus or pl'ate3" fromwhich rise posts fl, the; same being] slidably' received in holeseXte'ndingtrans-f, versely through the longitudinally slotted. bosses 6of the die stock 5; Aring thread-2 ed upon theneck 2 of the work holderserves to retain the annulus 3 against displacement" but permittingrotation portion of the neck 2 is threadedfor the reception'of theleader screw- 8' carried by thedie stock 5 whereby progressively movedin work holder as; the threading operation progresses. This is awell'known and famil iar construction in theartQ The slots or slideways9 in the bosses 6 are radial-1y arranged andcommunicate entirely throughthe said vbosses from the work' receiving opening of the die stocks; Itis to be noted that the. transverse post holes in the bossesfi are sodrilled asto intersect" the sli'dewaysfl' adjacent one side; also"thatthe posts 7 are provided with a flat longitu dinal face the edgesof-which are designed to lie flush with the side wall of each slide way.be fullyexplained hereinafter. i a

v As clearly shown in Figure-3; the'slideways 9' receive sliding diecarriers 10 of a thereof. The inner" the latter willfbe the direction of'the' The purposeof this construction will width equal to the width oftheslideways rier; The inner end "of" the screw'12'i's forme'dfwith ahead 12* which is receivable 11? extending" crosswise ofthe die.,.Thus'the-movementofthe die either toward or from the work receiving diestock is positively con-v be noted that the head '12 "of the screw "canonly be located in the-T-shaped slotll of the die when the carrier isout of the slide way 9. V When-the die and' cafrrie'r are the slidewaythe side-walls and overhanging top walls thereof engage the assembledmembers. to prevent such: relative movement as would permitdisengagement ofthe same,

dies or chasers 11; relative aperture in the upturnedlend '10? ofits carBy adjustably positioning the dies 11 in the carriers 10 it is possibleto thread work of difierent sizes with but one set of dies. A means hasbeen availed of whereby the dies can be accurately set for threadingstandard sized work. This means comprises the formation of the outerportions of each screw shank without threads and cutting therein aplurality of circumferential grooves 12 which are spaced certaindistances the one from the other. This distance is equal to one-half ofthe difierence between the diameters of standard sizes of pipe or otherwork. As shown in Figure 3, I have provided what might be termed awasher 13 having an over-sized opening to receive the screw '12. Thewasher is located between the thumb-piece 14: of the screw and theupstanding end portion 10 of [the carrier 10. When work of a certainsize is to be threaded the washer is located in the appropriate groove12 and the screw'advanced by means of thethumbpiece 14; until the washersnugly abuts against the outer face of the end of the carrier. Thisaction causes the washer to bind in the groove in which it is located.Thus the screw will be locked against accidental turning and it willtake a good firm twist on the thumb-piece 14 to loosen it, it beingunderstood that the washer binds against the end of the die carrier andin the groove, which will obviously produce the result above set forth.

It has heretofore been stated that the posts 4 have flat faces which,during the movement of the die stock, lielliisli with oneof the sidewalls of each slideway 9. These flat post faces are denoted in thedrawings by numeral 7*, and in Figure 3 the said flat post faces areclearly shown as being formed with diagonal surface grooves 7 arrangedin adirection leading away from the axis of the work, the lower ends 7of such grooves being curved abruptly in a direction away from the axisof the work. The grooves 7 are open at the upper ends of the said. poststo receive lugs 15 extending from one side of each of the carriers 10.The grooves 7 are designed to sustain the carriers 10 in the thread.cutting operation; also to efi'ect a gradual recession of the carriersas the, operation proceeds, acting of course, through the lugs 15,- andfinally through the instrumentality of the abruptly curved grooveportions 7 to precipitously actuate the carriers to completely withdrawthe dies from the work.

When it is desired to move the carriers from the slideways 9 it is onlynecessary to elevate the diestocks on the posts a sufficient distance sothat the lugs 15 of the carrier will be clear of the post grooves 7 Theslides 10 can then, of course, be slipped out of the slideways 9. Theposts 7 are of of the stock 5 when various odd sized work is to bethreaded. g

The die stock is rotated in' the usual manner by handles 16 received insockets 17 carried at diametricallyopposite points on the diestock. Uponone of the handles 16 I have illustrated a magazine for extra dies 11,the same comprehending fixed and slidable collars 18 and 20.'Circumferential flanges 18 and 20 respectively,-engage the ends of thedies 11 to hold them in place. A spring clip 21 engages notches 22 inthe handle section to hold the collar 20 against outward slidingmovement. A pin 19 passing through the member 18 and the handle 16maintains the said collar member 18 fixed. In Figure 8 I haveillustrated a slightly modified construction whereby the screw 12 willbe locked in a tion. Here a spring clip 23 is fixed to the upturned end10 of the carrier 10 andhas a depending portion 24 with an arcuate edgerecess which is designed toengage in a selected groove 12. in eitherdirection willbe prevented by the binding of the clip portion 2-1against the walls of the selected groove. In this modification the screw12 has no positive connection with the end of the die 11. Instead thecarrier 10 is provided with a spring pressed stud which is denoted bynumeral 25 and which is adapted to engage in rounded recesses 26 in thebottom ofthe die 11. The screw 12 of course sustains the die 11 duringvthe threading operation and the stud 2a engaging the recesses 25 causesthe die to recede withits carrier.

The invention eliminates amultiplicity of parts likely to get out oforder.' No chips can obstruct the operation of the tool and upon thecompletion of one piece of work it is unnecessary to back thread whichoperation is very hard on the die teeth besides taking up considerabletime;

What I claim as new and desire to secure by Letters Patent is 1. Thecombination with a work receiving opening communicating therewith; of adie supporting member arranged insaid slideway, a die removably carriedby said member and adjustable relatively thereof, a boss carried bysaiddie supporting member, a screw threaded through said boss andengaging a diestock having and a slideway predetermined posi-V Turningof the screw said die ,for actuatingthe same in the direcoperation, theshank of said screw adjacent its head being unthreaded and having aplu-z rality of circumferential grooves spaced to,

exactly agree with the ratio of difference in the diameters of standardsized work, and means selectively engaging said grooves to preventmovement of said screw to thus maintain the die in position to threadwork of a predetermined diameter.

2. The combination with a diestock having a work receiving opening and aslideway communicating therewith; of a die supporting member arrangedinsaid slideway, a die removably carried by said member and adjustablerelatively thereof, a boss carried by said die supporting member, ascrew threaded through said'boss and engaging said die for actuating thesame in the direction of the work, said screw constituting a stop forsustaining the die in the threading operation, the shank of said screwadj acent its head being unthreaded and having a plurality ofcircumferential grooves spaced to exactly agree with the ratio ofdifierence in the diameters of standard sized work, an adjustable stopcarried by said screw to selectively engage in said grooves whereby toengage the end of said boss when the screw is tightened to limit inwardmovement thereof, and said stop being adapted to bind against said bossand the walls of the groove in which 't 's positioned to restrain saidscrew against rotation.

3. The combination with a diestock, its dies, and screws threadedthrough tapped bosses and engaging the dies for moving the same towardthe work; of each screw having a plurality of spaced transverse grooves,an abutment selectively positionable,

in said grooves, said abutment being adapted to bind against said bossand the walls ofsaid grooves when the screw is tightened to restrain thesame agalnst movement. I

.fixedstop for its die,

. ward movement ation. each screw having a plurality of lonagainstmovement. In testimony whereof I affix my signature. v

4:. The combination with a diestock, a die 'member,and a dieposedbetween said the latter constituting,

designed to engage and bind in said grooves when brought to bear againstsaid tapped member.

5. In a diestock, a die on which'the dies are die carrier for 'eachrelatively adjustable for variously sizedwork, a boss formed upon eachof said carriers and forming a fixed stop for its die, a screw workingin said boss and sustaining its die ward movement in the thread cuttingoperation, each screw having a plurality of longitudinally spacedrecesses therein, and means engaging in said recesses and against saidboss for determining the proper position of said screw for threadingwork of a predetermined size.

6. In a diestock, a die carrier for each die on which the dies arerelatively adjustable for variously sized work, a boss formed upon eachof said carriers and forming a said boss and sustainlng its die againstout- 1n the thread. cutting opergitudinally spaced recesses therein, andmeans engaging in said recessesland against said boss for determiningthe proper position of said screw for threading work of said last namedmeans a predetermined size,

to lock said screw binding against said boss BRADFORD BORDEN.

a screw working in against out-1

